Unsent message for Karina Yu

Do I have to start this with how formal letters should be or get along with this being informal, so n-e-ways (anyways)?

Hi Karina,

...

I've been meaning to talk to you for the whole semester, but I really can't help myself from saying hi or saying such things. I wanted to tell you that you do look pretty in your new hairstyle, even in a long or other haircut you want. I really wanted to tell you that thing, but I really can't find words because telling you how pretty you are isn't to my liking because you are more than that. Do you know your physical presence can lighten up dark places?

I really can't help myself from looking at you. I swear to God, I find you very interesting. Oh, God, help me. It's just that every time I look at you, I find peace, and I can't help but smile and appreciate you. Heaven knows how much I desperately wanted to talk to you.

I tried smiling in the mirror for how many days so that if you ever caught me smiling, you would see me as beautiful? I tried imagining different scenarios while talking to you because I do think my plans to talk to you will be effective, but I remember I do live with my high expectations and imaginations, and it's actually a failure because you make me nervous and I can't think of what words to use or what to do to make everything okay, and right